class Request {
	constructor(options = {}) {
		// 请求的根路径
		this.baseUrl = options.baseUrl || ''
		// 请求的 url 地址
		this.url = options.url || ''
		// 请求方式
		this.method = 'GET'
		// 请求的参数对象
		this.data = null
		// header 请求头
		this.header = options.header || {}
		this.beforeRequest = null
		this.afterRequest = null
	}

	get(url, data = {}) {
		this.method = 'GET'
		this.url = this.baseUrl + url
		this.data = data
		return this._()
	}

	post(url, data = {}) {
		this.method = 'POST'
		this.url = this.baseUrl + url
		this.data = data
		return this._()
	}

	put(url, data = {}) {
		this.method = 'PUT'
		this.url = this.baseUrl + url
		this.data = data
		return this._()
	}

	delete(url, data = {}) {
		this.method = 'DELETE'
		this.url = this.baseUrl + url
		this.data = data
		return this._()
	}

	_() {
		// 清空 header 对象
		this.header = {}
		// 请求之前做一些事
		this.beforeRequest && typeof this.beforeRequest === 'function' && this.beforeRequest(this)
		// 发起请求
		return new Promise((resolve, reject) => {
			uni.request({
				url: this.url,
				method: this.method,
				data: this.data,
				sslVerify: false, // 验证 ssl 证书(默认是true)
				header: this.header,
				success: ({
					data
				}) => {
					resolve(data)
				},
				fail: (err) => {
					reject(err)
				},
				complete: (res) => {
					if (res.statusCode === 401) {
						uni.showToast({
							title: 'token过期',
							icon: 'none',
						});
						try {
							uni.removeStorageSync('app_token');
						} catch (e) {
							// error
							console.log(e);
						}
						uni.reLaunch({
							url: '/pages/login/login'
						});
					} else if (res.statusCode !== 200) {
						uni.showToast({
							title: '系统异常',
							icon: 'none',
						})
					}
					// 请求完成以后做一些事情
					this.afterRequest && typeof this.afterRequest === 'function' && this
						.afterRequest(res)
				}
			})
		})
	}
}

export const $http = new Request()